/Engine/Source/Runtime/GeometryCore/Public/DynamicMesh/DynamicMeshTriangleAttribute.h
Set this overlay to contain the same arrays as the copy overlay
void Copy ( const [TDynamicMeshTriangleAttribute](API\Runtime\GeometryCore\DynamicMesh\TDynamicMeshTriangleAttribute)< AttribValueType, AttribDimension > & Copy )